Hi, I feel kind of dumb for asking this, but I can't honestly find the
answer anywere.
I came across a attribute defined like:
class BlahBlah
def something=(x,y)
#code
end
end
I tried to assign the values as:
BlahBlah.something=(5,10)
and
BlahBlah.something=5,10
and
BlahBlah.something(5,10)
but all give me a "1 for 2" argument error (except for the last which
don't work because something is not a method).
All examples I came across either used only one argument, or defined
something as a method (strip the =).
How can I assign values to this tipe of attribute?
thanks
···
--
Posted via http://www.ruby-forum.com/.
Ruby only allows a single value to be assigned using the = operator.
However, you can assign an array to multiple values:
a, b = [1, 2]
puts a #=> 1
puts b #=> 2
When you try to assign multiple values using the = operator you
defined, Ruby is converting the arguments on the right hand side into
an array; hence the "1 for 2" argument error you mentioned. I would
try something like this
class BlahBlah
def something=( *args )
x, y = args
puts x
puts y
end
end
BlahBlah.new.something = 1
BlahBlah.new.something = 1, 2
#=> 1
#=> nil
#=> 1
#=> 2
In the first assignment, y gets the value of nil.
Hope this helps 
TwP
···
On 7/24/06, Andrew Huh? <genooma@gmail.com> wrote:
Hi, I feel kind of dumb for asking this, but I can't honestly find the
answer anywere.
I came across a attribute defined like:
class BlahBlah
def something=(x,y)
#code
end
end
I tried to assign the values as:
BlahBlah.something=(5,10)
and
BlahBlah.something=5,10
and
BlahBlah.something(5,10)
but all give me a "1 for 2" argument error (except for the last which
don't work because something is not a method).
All examples I came across either used only one argument, or defined
something as a method (strip the =).
How can I assign values to this tipe of attribute?
thanks
--
Posted via http://www.ruby-forum.com/\.
Well this is pretty questionable code, but if you need to call it try:
b = BlahBlah.new
b.send :something=, x, y
Good luck
pth
···
On 7/24/06, Andrew Huh? <genooma@gmail.com> wrote:
I came across a attribute defined like:
class BlahBlah
def something=(x,y)
#code
end
end
How can I assign values to this tipe of attribute?
thanks
Andrew Huh? wrote:
I tried to assign the values as:
BlahBlah.something=(5,10)
and
BlahBlah.something=5,10
and
BlahBlah.something(5,10)
blah = BlahBlah.new
blah.__send__(:something=, 5, 10)
Though it's likely a dumb idea to define =-methods in this way.
That is very strange code you've posted. I wonder what the original author intended? The only way I could get a two-argument writer method to run was as follows:
#! /usr/bin/ruby -w
class M
attr_reader :m
def initialize
@m = [0, 0]
end
def m=(x, y)
@m = [x, y]
end
end
foo = M.new
p foo.m => [0, 0]
foo.send(:m=, 1, 2)
p foo.m => [1, 2]
------- end of code --------
The above proves that a two-argument writer can be called (sort of), but it really doesn't cast any light on what it would be used for. I hope some wiser head will clarify this.
Regards, Morton
···
On Jul 24, 2006, at 11:07 AM, Andrew Huh? wrote:
Hi, I feel kind of dumb for asking this, but I can't honestly find the
answer anywere.
I came across a attribute defined like:
class BlahBlah
def something=(x,y)
#code
end
end
I tried to assign the values as:
BlahBlah.something=(5,10)
and
BlahBlah.something=5,10
and
BlahBlah.something(5,10)
but all give me a "1 for 2" argument error (except for the last which
don't work because something is not a method).
All examples I came across either used only one argument, or defined
something as a method (strip the =).
How can I assign values to this tipe of attribute?
thanks
--
Posted via http://www.ruby-forum.com/\.
Tim Pease wrote:
Ruby only allows a single value to be assigned using the = operator.
However, you can assign an array to multiple values:
[..]
Hope this helps
TwP
Yep, that certainly helped, I should smack the programmer in the head
then?, perhaps he placed the = by accident.
Thanks!
···
--
Posted via http://www.ruby-forum.com/\.
Morton Goldberg wrote:
The above proves that a two-argument writer can be called (sort of),
but it really doesn't cast any light on what it would be used for. I
hope some wiser head will clarify this.
Regards, Morton
Now that I know this is not common (I don't have much real life
experience with ruby), I'm sure he placed the = by accident.
···
--
Posted via http://www.ruby-forum.com/\.
Mind you, in some languages (well, at least - don't shoot ! - Visual
Basic), it allows to type (the equivalent of) blah.something(10) = 5
(first argument is the value assigned, the others passed in the
partenthesis).
Fred
···
Le 24 juillet 2006 à 18:36, Florian Frank a écrit :
Though it's likely a dumb idea to define =-methods in this way.
--
When you're brought into this world
They say you're born in sin Well at least they gave me something
I didn't have to steal or have to win Well they tell me that I'm wanted
Yeah, I'm a wanted man (Bon Jovi, Blaze of Glory)
Hi,
At Tue, 25 Jul 2006 09:20:05 +0900,
F. Senault wrote in [ruby-talk:203659]:
Mind you, in some languages (well, at least - don't shoot ! - Visual
Basic), it allows to type (the equivalent of) blah.something(10) = 5
(first argument is the value assigned, the others passed in the
partenthesis).
It's tough for ruby parser.
···
--
Nobu Nakada
Sure, ruby already has plenty of constructs for this purpose. I was
just pointing a possible origin of the idiom.
Fred
···
Le 25 juillet 2006 à 09:34, nobu@ruby-lang.org a écrit :
Hi,
At Tue, 25 Jul 2006 09:20:05 +0900,
F. Senault wrote in [ruby-talk:203659]:
Mind you, in some languages (well, at least - don't shoot ! - Visual
Basic), it allows to type (the equivalent of) blah.something(10) = 5
(first argument is the value assigned, the others passed in the
partenthesis).
It's tough for ruby parser.
--
Just a reflection Just a glimpse Just a little reminder Of all the
what abouts And all the might have Could have beens Another day Some
other way But not another reason to continue And now you're one of us
The wretched (Nine Inch Nails, The Wretched)